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820 NOT PUMPING GAS

Posted: Fri Jan 01, 2010 11:19 pm
by Jim Waltz
Ok guys, I need some help.

I've got a few 820's available to put on my yellow Lotz '64 SAE repro so I can make it to Adams.

So far two of them, an older original West Bend and a newer US Motors, have good spark, good or great compression, will hold 10 psi crankcase pressure and will fire if I prime them. However they won't continue to run.

Appears that gas is not pumping to the carb - even using my KT 100 starter adapted to the PTO with a long hex and a "jam" sockethead cap screw. Engines turn over very quickly with this starter (got tired of the recoil thing) so they ought to pump just like my KT 100's.

I have a nice new E.C. Carbs HL 306B that I have swapped out for the carbs that came on the engines. Makes no difference. Yes, I've double checked reed cage, gasket and carb pulse ports are all on the same side.

I'm very frustrated and don't want to miss Adams.

Anybody got any ideas?

Re: 820 NOT PUMPING GAS

Posted: Sat Jan 02, 2010 1:31 am
by steveohara
Jim,
You've covered all the normal bases so it is something odd. I love a challenge.
Send it to me and I'll make it run.
Include a return shipping label and there will be no charge.
Steve O'Hara

Re: 820 NOT PUMPING GAS

Posted: Sat Jan 02, 2010 6:38 am
by Gene Luzader
Jim
It sounds like you have the small vacuum hole from the crankcase to the carb blocked.
Check the gasket alighment and hole position.

Gene Luzader
412-824-8234

Re: 820 NOT PUMPING GAS

Posted: Sat Jan 02, 2010 8:50 am
by Rob Voska
1. Fuel on?

2. Got fresh gas so oil didn't seperate?

3. Tank outlet plugged?

4. Good fuel line without cracks or leaks?

5. Carb inlet needles stuck? Take off carb top plates and check needle.

6. Check all holes for pulse alignment. Use a wire and check the carb gasket to both the manifold and carb.

7. Check for silicone or something that can swing out of the way of a wire but flex back into position.

8. Make sure plastic carb top has no air leaks. Just hook up a popoff gage and see where carb pops.

You should be able to pull engine over slowly by hand and the fuel should move a inch or so with every revolution.